Mark HTMLMediaElement media tracks functionality as stable

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index 58f83cf70ca2b10351234242c41770ca26edb674..86e6e4f04f287ad1467c17977fff5f5d5f645339 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -2396,14 +2396,12 @@ void HTMLMediaElement::togglePlayState()
 
 AudioTrackList& HTMLMediaElement::audioTracks()
 {
-    DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
     return *m_audioTracks;
 }
 
 void HTMLMediaElement::audioTrackChanged(WebMediaPlayer::TrackId trackId, bool enabled)
 {
     BLINK_MEDIA_LOG << "audioTrackChanged(" << (void*)this << ") trackId= " << String(trackId) << " enabled=" << boolString(enabled);
-    DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
 
     audioTracks().scheduleChangeEvent();
 
@@ -2431,9 +2429,6 @@ WebMediaPlayer::TrackId HTMLMediaElement::addAudioTrack(const WebString& id, Web
     BLINK_MEDIA_LOG << "addAudioTrack(" << (void*)this << ", '" << (String)id << "', ' " << (AtomicString)kindString
         << "', '" << (String)label << "', '" << (String)language << "', " << boolString(enabled) << ")";
 
-    if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
-        return blink::WebMediaPlayer::TrackId();
-
     AudioTrack* audioTrack = AudioTrack::create(id, kindString, label, language, enabled);
     audioTracks().add(audioTrack);
 
@@ -2444,22 +2439,17 @@ void HTMLMediaElement::removeAudioTrack(WebMediaPlayer::TrackId trackId)
 {
     BLINK_MEDIA_LOG << "removeAudioTrack(" << (void*)this << ")";
 
-    if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
-        return;
-
     audioTracks().remove(trackId);
 }
 
 VideoTrackList& HTMLMediaElement::videoTracks()
 {
-    DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
     return *m_videoTracks;
 }
 
 void HTMLMediaElement::selectedVideoTrackChanged(WebMediaPlayer::TrackId* selectedTrackId)
 {
     BLINK_MEDIA_LOG << "selectedVideoTrackChanged(" << (void*)this << ") selectedTrackId=" << (selectedTrackId ? String(*selectedTrackId) : "none");
-    DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
 
     if (selectedTrackId)
         videoTracks().trackSelected(*selectedTrackId);
@@ -2475,9 +2465,6 @@ WebMediaPlayer::TrackId HTMLMediaElement::addVideoTrack(const WebString& id, Web
     BLINK_MEDIA_LOG << "addVideoTrack(" << (void*)this << ", '" << (String)id << "', '" << (AtomicString)kindString
         << "', '" << (String)label << "', '" << (String)language << "', " << boolString(selected) << ")";
 
-    if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
-        return blink::WebMediaPlayer::TrackId();
-
     // If another track was selected (potentially by the user), leave it selected.
     if (selected && videoTracks().selectedIndex() != -1)
         selected = false;
@@ -2492,9 +2479,6 @@ void HTMLMediaElement::removeVideoTrack(WebMediaPlayer::TrackId trackId)
 {
     BLINK_MEDIA_LOG << "removeVideoTrack(" << (void*)this << ")";
 
-    if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
-        return;
-
     videoTracks().remove(trackId);
 }
 
@@ -3683,9 +3667,6 @@ DEFINE_TRACE_WRAPPERS(HTMLMediaElement)
 
 void HTMLMediaElement::createPlaceholderTracksIfNecessary()
 {
-    if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
-        return;
-
     // Create a placeholder audio track if the player says it has audio but it didn't explicitly announce the tracks.
     if (hasAudio() && !audioTracks().length())
         addAudioTrack("audio", WebMediaPlayerClient::AudioTrackKindMain, "Audio Track", "", true);
@@ -3697,9 +3678,6 @@ void HTMLMediaElement::createPlaceholderTracksIfNecessary()
 
 void HTMLMediaElement::selectInitialTracksIfNecessary()
 {
-    if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
-        return;
-
     // Enable the first audio track if an audio track hasn't been enabled yet.
     if (audioTracks().length() > 0 && !audioTracks().hasEnabledTrack())
         audioTracks().anonymousIndexedGetter(0)->setEnabled(true);